Look at all the beautiful articles we have put together for you! All sorts of handy resources!
We have a friendly and active community of embedded developers. Throw your questions out there... it's likely someone has the answer!
There have actually been a couple of books written about TDD for Embedded C. They even use our tools!
Mike and Mark, two of our core developers, have created an online course to teach you TDD using Unity.
Some of our core team works as consultants. We have good relationships with some other consultants. Feel free to contact them if interested in training!